<html><head></head><body><p dir="ltr">In a rescue or recovery scenario with obviously disabled occupants (Thinking hypercapnia, hypoxia, cardiac arrest, etc.)? Get it open no matter what it takes. I'd probably look to loosen a fitting first, but in the absence of anything obvious, drilling a hole in an acrylic viewport takes no time at all.</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote">On October 6, 2014 4:59:56 PM MDT, Hugh Fulton via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="k9mail"><br />A point that I have been pondering is that DW's pull a vacuum and I plan to<br />pull a vacuum as is also possible with any other system. My question is in<br />the event of an emergency where the Sub is on the surface or brought to the<br />surface with an unconscious bod inside and a vacuum, then what methods are<br />available to get air back inside to allow surface support to get the hatch<br />to open. With a vacuum then it would be almost impossible to open the hatch<br />against the vacuum. Positive pressure is not a problem as a relief valve<br />will compensate automatically. If the relief valve is easily accessible<br />then it can be unscrewed. What others are being used? Hugh<br /><br /><br /><br />-----Original Message-----<br />From: Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org]<br />On Behalf Of hank pronk via Personal_Submersibles<br />Sent: Tuesday, 7 October 2014 11:27 a.m.<br />To: Personal Submersibles
General Discussion<br />Subject: Re: [PSUBS-MAILIST] bellows add<br /><br /><br />Alan,<br />I am sure they have a system that reacts to high O2 levels etc etc I think<br />my situation is unique and a bellows add does not makes sense.<br />Hank<hr /><br />On Mon, 10/6/14, Alan James via Personal_Submersibles<br /><personal_submersibles@psubs.org> wrote:<br /><br /> Subject: Re: [PSUBS-MAILIST] bellows add<br /> To: "Personal Submersibles General Discussion"<br /><personal_submersibles@psubs.org><br /> Received: Monday, October 6, 2014, 6:19 PM<br /> <br /> I agree<br /> Hank,I think<br /> you should email Phil & warn him:)I have thought that if there was an air<br />leak in to the cabin the bellows add systemwould stop adding O2. They have<br />a manual system integrated into the bellows addunit & a continual feed of<br />O2 regardless of the belows. They would have O2 monitorswith set point<br />alarms if the O2 % was too high or low but how they would
address analarm<br />issue I don't know.I like Cliff's method of having a set volume flowing in<br />(as per<br /> DW) & O2 addition generatedby O2<br /> measurements opening an O2 solenoid valve via a PLC. This is similar to<br />arebreather & James Cameron's system on the Deepsea Challenger.Don't get<br />me going on the coffee issue. I buy green beans & roast them. Would<br />growthem if we had the climate. My side of Auckland had power. Hugh lives<br />on the Dark side.Alan<br /> <br /> <br /> From: hank pronk via<br /> Personal_Submersibles<br /> <personal_submersibles@psubs.org><br /> <br /> To:<br /> personal_submersibles@psubs.org<br /> Sent: Tuesday, October<br /> 7, 2014 10:07 AM<br /> Subject:<br /> [PSUBS-MAILIST] bellows add<br /> <br /> <br /> I have been pondering the idea of a bellows add system for Gamma. I am<br />not sure how the DW deals with pressure change due to temperature change. <br />When I am diving Gamma the
temperature swing is huge causing a big<br />negative pressure inside. A bellows add system would be dumping O2 in like<br />mad. Does the DW have an automatic O2 over ride or an automatic air<br />release to compensate. Does the pilot manually add air to avoid O2 build<br />up.<br /> When I surface after a dive without the scrubber or O2 feeding in, I have<br />to open my hatch vent valve for what seems like forever to equalize the sub<br />to open the hatch. It is getting better with the air temps dropping. I<br />can't wait to go for a dive when it is snowing. <br /> Hank<br /><hr /><br /> Personal_Submersibles mailing list<br /> Personal_Submersibles@psubs.org<br /> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br /> <br /> <br /> <br /> <br /> -----Inline Attachment Follows-----<br /> <br /><hr /><br /> Personal_Submersibles mailing list<br />
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